https://github.com/ImageMagick/ImageMagick/issues/547

diff --git a/coders/mat.c b/coders/mat.c
index 0171eb772821e883dfc29eae859031a94b59ac66..f9155c5372765b154884b7fe7a243afb55a4fc1c 100644 (file)
--- a/coders/mat.c
+++ b/coders/mat.c
@@ -1301,7 +1301,8 @@ done_reading:
   if (quantum_info != (QuantumInfo *) NULL)
     quantum_info=DestroyQuantumInfo(quantum_info);
 END_OF_READING:
-  clone_info=DestroyImageInfo(clone_info);
+  if (clone_info)
+    clone_info=DestroyImageInfo(clone_info);
   CloseBlob(image);